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Environmental fate & pathways

Phototransformation in air

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Description of key information

Not relevant due to low vapour pressure

Key value for chemical safety assessment

Additional information

No experimental data evaluating the potential for photodegradation of Fatty acids, C12-16 (even numbered) and C18 unstd., methyl esters (CAS No. 1234694-02-0) in air are available. As the substance is a complex UVCB substance, QSAR calculations on representative fatty acid components (C12, C16 and C18 unsaturated) have been performed (AOPWIN v1.92), resulting in estimated half-lives (DT50 values) of 29.2 (C12), 20.4 hours(C16) and 4.7-5.1 hours (C18 unsaturated; by reaction with OH radicals, 24h-day (López Parrón, 2011)).The values obtained for the representative components indicate that Fatty acids, C12-16 and C18 unstd., methyl esters is susceptible to indirect photodegradation in air. Nevertheless, based on its low vapour pressure value (≤ 0.96 Pa) the substance is not expected to be present in the atmosphere in significant amounts. Therefore, photodegradation in air is not a relevant environmental fate process for Fatty acids, C12-16 (even numbered) and C18 unstd., methyl esters. As this study is not a standard information requirement according to Regulation (EC) No. 1907/2006 and there is no indication from the CSA according to Annex I on the need to investigate further the fate and behavior of the substance (Annex X requirement), no testing is considered necessary.

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